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UnitedHealth changes reverberate through health care system

William McGuire's retirement from UnitedHealth Group shakes up one of the most influential companies in the nation, and raises questions about the role of the private sector in the nation's health care system.

MPR's Perry Finelli spoke with Jonathan Weiner, professor of health policy and management at Johns Hopkins University, about the Minnetonka-based company's influence on health care in the U.S.